The following properties for air and combustion gas may be used:

For air: Cpair = 1.005 kJ/kg-K, = 1.4

For post combustion gas: Cpgas= 1.148 kJ/kg-K, = 1.333 for air and gas after combustion,

R = 287 J/kg-K

State all the necessary assumptions in your calculations.

a. A big fan is now being installed in front of the compressor. The estimated pressure ratio is 1.6. How many stages of low pressure turbine are required in order to drive the big fan? Provide reasons to support your answer.

b. What is the bypass ratio as a result of this modification? Are there any advantages in increasing the bypass ratio?

c. What is the percentage increase in thrust after this installation? Please show your calculations clearly.